Shank and bit punch



July 22 1924. v 1,502,648

W. A. SMITH SHANK AND BIT PUNCH v Original Filed April 24. 1920 3 Sheets-Sheet 1 INVENTOR WilZiamZI. 522211372 H\6 ATTO EY July '22 1924. 1,502,648

w. A. SMITH SHANK AND BIT PUNCH Original Filed April 24, 1920 3 Sheets-Sheet 2 @@@J WWW/4mm E INYENTOR M Hi5 ATTOR EY Jul 22 1924. 1,502,648

W. A. SMITH SHANK AND BIT PUNCH Original Filed April 24 1920 3 Sheets-Sheet 3 INVENTOR mlliamA.5miZ/2 BY Patented July 22, 1924:.

UNETED FTATES 1,502,648 PATENT QFFlQE.

WILLIAM A. SMITH, OF DETROIT, MICHIGAN, ASSIGN'OR TO INGEBSOLL-EAND COM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SHANK AND err PUNCH.

Original application filed April 24-, 1920, Serial No. 376,306. Patent No. 1,395,747, dated. November 1,

To all whom it may concern: I

Be it known that I, WILLIAM A. SMITH,

a citizen of the United States, and a resident of Detroit, county of Wayne, and State of Michigan, have invented a certain Shank and Bit Punch, of which the following is a specification, accompanied by drawings.

This application is a division of S.

Patent No. 1,395,747, granted November 1, 1921. This invention relates to machines for punching the bits and shanks of hollow drill steels or similar tools, for use more especially during the processes of sharpen ing and re-shanking the steels, in order to reopen the holes in the bits or shanks to the required extent after the heating and forging operations.

The primary object of the invention is to secure a quick acting machine by means of which a pin may be accurately driven into the hollow steel or tool and withdrawn under complete control of the operator.

Difliculty is sometimes experienced in pushing a pin into a hollow steel or tool, especially at the shank end, which may require deeper punching than the bit end, and an object of the present invention is to enable the pin to be automatically tapped or hammered into the tool or article to be punched by fluid actuated means as the punching mechanism is fed forward, instead of being merely pushed in. v

Another'object of the invention is to provide manual actuating means for feeding the punching mechanism forward, which may be started and stopped as desired. Any suitable means, as a spring, may be provided for returning the punching mechanism to its initial or startingposition upon release of the manual force applied for the forward feeding movement.

Means may also preferably be provided for automatically admitting fluid pressure to the punching mechanism after the forward feeding movement has been started by the manual feeding means and for cutting, off said fluid pressure upon the return of the punching mechanism to starting position. p

Further objects of the invention will hereinafter appear and to all of theseends the invention consists of the features of construction and combinations of, elements described claimed int-this; specification Divided and this application filed October 3, 1921.

Serial No. 505,135.

and shown in the accompanying drawings, in which I v Figure 1 is a side elevationof a bit and sh ank punch shown mounted on a drill sharpener for convenience,

Figure is an enlarged longitudinal sectional elevation of the fluid actuated punchs m i m r r ycb oken W n Figurefi is a side elevation of a modified former mechanism, p p w I Figure 4; is an enlarged detail iew partly in longitudinal section of a pin holder forming an anvilblock and means for removably holding a pin in the holder,

Figure 5 is a transverse sectional view on the line 55 of Figure 4: looking in the direction of the arrows,

Figure 6 is a view similar to Figure 4 of a modified form of pin holder and anvil block, and

Figure 7 is a transverse sectional view on the line 7-7 of Figure 6 looking in the direction of the arrows.

The punching machine may be mounted upon a separate pedestal but for convenience the machine is shown attached to a drill sharpener A the outline of which is indicated in dot and dash lines, so that the jaws B and C of the drill sharpener may be utilized for clamping the drill steel D in place during the punching.

As shown in this instance a bracket E is suitably secured to the frame of the drill sharpener A as by means of the bolts F and guiding means preferably in the form of a guide bar G extends horizontally from the bracket E, in convenient position for slidahly supporting the fluid actuated punching mechanism opposite the location of the drill steel D or article to be punched.

The punching mechanism. forming one element of this invention preferably comprises a percussive tool of the hammer type having a cylinder casing H suitably mount ed upon a carriage J slidably supported upon the guide G but held from rotation by a suitable key K. A punch in the form of a pin L is adapted to be tapped or hammered into thedrill steel D by blows in one direction of the hammer piston O reciprocating inthe cylinder casing H, and hammered out of the drill steel by blows of the hammer piston in the opposite direction. Suitable ment y can-trolled either by the foot or hand of the operator as indicated in Figuresl and 3 are preferably provided for bodily feeding the punching mechanism forward as the hammer operates.

% Suitable spring actuated means under the backward by manual means under direct.

control of the operator, a the hammer piston operates, and in some instances, such operation might be preferable.

The punching mechanism in the form of a percussive tool may be of any suitable or usual construction and in this instance the cylinder casing H is provided with the front head Q, the back head R and the back end portions, all adapted to be secured together and to the collar T of the carriage J as by means of the side bolts U. A suitable anvil block V has a limited movement within the front head Q and forms a holder for the pin L which may be inserted within the end of the anvil block or holder V and held in place by means of the transverse pin W shown in detail in Figures 4 and 5. The pin is retained in position by means of a suitable retainer in the form of a circular spring X having apertures in its ends through which the pin passes. In Figure 2 the anvil block V is shown in its rearward posit-ion in the front head Q, and in the path of the piston to receive the impact blows.

In the modification of the pin retaining means shown. in Figures 6 and 7, a short pin Y is held within the pin holder V by means of the spring sleeve Z.

The percussive tool forming the punching mechanism is constructed in any suitable manner to provide for the distribution of fluid pressure to the portions of the cylinder for actuating the hammer piston O, in this instance fluid pressure being admitted at the inlet a and in the position of the parts shown in Figure 2 passes through the passageway b and port 0, to the forward portion of the cylinder and thence through the port (Z and passage way 0 to the rearward portion of the cylinder as indicated by the arrows for operating the piston forward. The rearward portion of the cylinder is exhausted through the exhaust port 7 and during the operation of the tool constant pressure is maintained on the rearwardly acting surface of the piston formed by the shoulder g, forming a cushion on the forward stroke. As thepunching mechanism is moved backwardly or retracted along the 1 guide bar CT, the anvil block V assumes its forward position in the front head out of the path of the piston.

A spring controlled valve h is preferably provided in the end portion S of the machine for automatically controlling the starting and stopping of the piston. This valve is provided with an extension j adapted to bear against the stop Zc when the punching mechanism is in retracted posit-ion, thus automatically shutting off the supply of fluid pressure to the cylinder. After the punching mechanism is moved away from the stop the valve h automatically opens and the piston is started in operation.

In Figure 1 suitable means are shown actuated and controlled by the foot of the operator for moving the punching mechanism forward as the pin L is hammered into the drill steel. or article to be punched. Any suitable means may be provided for this purpose and in this instance the bell crank lever 0 is pivoted at p to the bracket E, one arm of the bell crank lever being connected to the carriage J by the link 9, the other arm being connected to a foot lever r by means of the spring pressed rod .9 sliding within the socket t. A" spring a is adapted to be compressed between the flange '0 on the rod 8 and the end of the socket t, so that upon pressing down on the outer end of the foot lever r, the bell crank lever 0 is rocked to feed the punching mechanism forward, and the compression spring it acts to take up the vibration in the links and levers. Upon releasing the pressure applied by the foot of the operator, the retracting spring returns the punching mechanism to its initial or starting position, as the pin L is hammered out of the drill steel.

In the modification of the invention shown in Figure 3 hand operated means are provided for feeding the punching mechanism forward. In this instance a rod to is slidably inserted within a sleeve :10 pivoted at 3/ to the carriage J. The rod w may be provided with a collar 2 between which and the sleeve 00 a spring 2- is placed. Another spring 3 is preferably placed between the sleeve 03 and a nut 4 at the end of the rod on, these springs 2 and 3 being for the purpose of taking up vibration. The rod 21; is pivoted at 5 to a hand lever 6 which in turn is pivoted at the point 7 to the bracket E. As the hand lever 6 is pulled forward towards the operator, the punching mechanism is fed forward and upon release of the force supplied by hand, the retracting spring returns the punching mechanism to its initial or starting position. I

I claim:

In a machine for re-opening the bits and shanks of hollow drill steels and similar tools, the combination of means for holding the drill steel, punching mechanism in the form of a guide bar and a cylinder slidably mounted thereon, an anvil block having limlevers for sliding the cylinder forwardly ited longitudinal movement in said cylinalong said guide bar for forward feeding 10 der, a pin removably held by said anvil and for returning the cylinder to its initial block, a fluid actuated piston adapted to reposition.

ciprocate in said cylinder for hammering In testimony whereof I have signed this the pin into the drill steel, a spring tending specification.

normally to hold said cylinder in a direction away from said steel manually actuated WVILLIAM A. SMITH. 

